Cody Barrasse, 22, was a senior who had been scheduled to graduate soon from Penn State. His father, Michael Barrasse, is a common pleas judge in Lackawanna County in eastern Pennsylvania.

Pittsburgh police said Cody Barrasse was walking near Bates and Bouquet streets at about 2:15 a.m. on April 6 when the accident happened.

District Attorney Stephen Zappala Jr. said video surveillance cameras and other evidence showed no criminal culpability in Barrasse's death. He said the investigation will remain open, and charges could be filed if new evidence surfaces.

The car's driver told police Barrasse and his friends surrounded the car and started pounding on the hood. The driver hit the accelerator, hitting Barrasse in the 3800 block of Bates.

Barrasse's friends told police that the driver hit him on purpose. Investigators said the driver left the scene, but immediately called police to report the crash.

"I saw someone laying in the street just not moving, and a bunch of ambulances and police came up and the kid was just unresponsive," said witness Will White.

While the driver says he was surrounded by three men who beat on his car, a friend of Barrasse told another student that it did not happen.